Double-index loom dobby



H. BARDSLEY.

DOUBLE ,INDEX LOOM DOBBY. APPLICATIONVFILFD N0v.2o, x920.

Patented Nov. 28, 1922..

2 SHEETSSHEET I- H. BARDSLEY. DOUBLE INDEX LOOM DOBBY APPLICATION FILED NOV-20, 1920,

Patented Nov. 28, 1922 2 SHEETS-SHEET 2.

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U a w F the parts HENRY KNOWLES 1100M WORKS, A CORPORATION OF MASSACHUSETTS.

DO B E-INDEX LOOM BOBBY.

Application filed. November 20, 1920. Serial No. 425,520.

T 0 all whom it may concern Be it known that I, HENRY BARDSLEY, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Double-Index Loom Dobby, of which the following is a specification.

This invention relates to improvements in a loom dobby of the type found in the prior patent to Davenport and Bardsley, No. 691,608, granted January 21, 1902. The patent shows a double index dobby an ranged for indicating two separate weaves on one set of pattern cylinder bars, the change from one weave to the other being accomplished bychanging the time relation between the advance movement of the cylinder and the movements of the reciprocating lifter knives. This change is preferably accomplished by retarding the cylinder one pick when a change of weave is desired.

It is the general object of my invention to improve the mechanism for thus changing the weave, simplifying the construction thereof, and reducing the cost of manufac-' ture. 1

Another object is to provide a construction in which the usual operation of the worm and worm wheel drive is not interrupted when the weave is changed.

'With these objects in view my invention relates particularly tocertain arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in theappended claims.

A preferred form of the invention is shown in thedrawings in which 7 Fig. 1 is a side elevation of a dobby embodying my improvements;

Fig. 2 is an end elevation thereof? Fig. 3 is a vertical, sectional view along the axis of the cylinder shaft; and

Figs. 1 and 5 are sectional. views taken along the line t5 in Fig. 3 and showing in different successive positions. I have shown my improvements applied to a dobby of the general type found in said prior patent, comprising a frame '10 in which are mounted the usual reciprocating lifter knives 11 and 12, dobby hooks 13, hook levers 14, and jacks 15. The knives are reciprocated alternately by the usual rock arm 16 which is rocked in one direction or the other at each beat of the lay, by driving connections not shown. Indicator fingers 17 (Fig. 2) are pivotally mounted in the frame 10 and control the position of the hooks 13 in the usual way.

A pattern cylinder 19 is mounted on a cylinder shaft 20 rotatable in bearings in the frame 10 and operates the pattern chain 21 which is preferably of the type shown in Fig. 5 of said Davenport and Bardsley patent. A worm gear 22 is mounted to rotate freely about the aXis of the shaft 20 and is intermittently advanced by a dwell worm 23, (Fig. 1) fixed to a shaft 2% which may be conveniently rotated by a sprocket 25 and chain 26.

The parts thus far described are of the usual type and form no part of my present invention.

I will now describe the improved devices by which I connect the worm wheel 22 to the cylinder shaft 20 and provide for retarding the cylinder when a change of weave is desired.

The worm wheel 22 is'loosely mounted on a sleeve 27 which in turn is loose on the cylinder shaft 20 but is connect-ed to rotate therewith by a give-way connection 28 which may be of any usual type and merely prevents breakage if the rotation of the pattern cylinder is accidently interrupted. A collar 30 is fixed to the sleeve 27 and has a slotted projection in which a U-shaped latch 31 is pivotally mounted. One end of the latch extends into a recess 32 in the col lar 30 and is provided with a spring 33 which normally holds the latch in the position shown in Fig. 3.

The worm wheel 22 is provided with an outer series of projections 34 (Fig.4) and w an inner series of projections 35. The latch 31 when in the position shown in Fig. 3 engages one of the inner projections 35 as shownin Fig. 4:. When the engaging portion of the latch. is swung outward. however, the latch will be released from the projec tion 35 and the worm gear 22 will advance of a revolution before the latch 31 is engaged by the next outer projection 34:, as shown in Fig. 5. This idle advance movement of the worm wheel changes the time relation between the cylinder and the knives by an amount representing one pick of the loom, thus reversing the weave as fully explained in said prior patent.

Such movement of the latch 31 from its inner to its outer position is controlled by a. collar 3:4 slidablc on the sleeve 2? and positioned by a forked bell crank lcv 35 connected by a link 36 to an indicator bar 3'7 (Fig. 1). The position of. the bar 37 is controlled by a special pattern chain 38 intermittently advanced by a pawl 39 pivoted to the rock arm 16. The chain 38 is mounted on a sprocket wheel d0 rotatable on a short shaft 41 and provided with a ratchet 42 for engagement by the pawl 39.

A shield 43 is loosely mounted on the shaft 2-1 and has a slotted downward projection L4: (Fig. 1) to receive a stud 4L5 mounted on a bell cran L6 also loosely pivoted on, the shaft 41 and connected by a link 47 to a special indicating finger d3 controlled by the pattern chain 21.

The shield 43 normally prvents engage ment of the ratchet 42 by the pawl 39. When, however, the indicator finger 48 is raised by a special projection 50 on the chain 21., the shield is withdrawn and the pawl 39 is permitted to advance the chain 38 one step. When a projection 51 of the chain 38 is thus advanced under the indicator bar 37, the bell crank 35 is actuated to slide the collar on the bushing 37 against the tension of the spring 33, moving-the latch 31 to its outer operative position. The parts remain in this position until the chain 38 is again advanced to release the indicator bar 37.

I have thus provided an extremely simple and reliable mechanism for intermittently rotating the pattern cylinder 19 and at the same time permitting the cylinder to be retarded one pick for change of weave. Attention is called to the fact that the regular operation of the worm 23 and worm wheel 22 is not interrupted when a change of weave occurs.

.Having thus described my invention it will be evident that changes and modifications can be made therein by those skilled in the art within the spirit and scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is:-

1. In a double index loom dobby, a pat tern cylinder, a shaft to which sai d cylinder is secured, a driven member freely rotatable about the axis of said shaft. and means to connect said member to said shaft, said means including a device operative to connect said member and shaft in a series of different angular driving relations.

2. In a. double index loom doloby, a pattern cylinder, a shaft to which said cylinder is secured, a driven member freely rotatable about the axis of said shaft, and means to connect said member to said shaft in successive equally spaced angular relations.

In a double index loom doloby, a pattern cylinder, a shaft to which said cylinder is secured, a driven member freely rotatable about the axis of said shaft, and means to connect said member to said shaft in successive positions separated by angular spaces, each equal to the angular advance movement of the cylinder equivalent to one pick of the loom.

4. In a double index loom dobby, a pattern cylinder, a shaft to which said cylinder is secured, a driven member freely rotatable about the axis of said shaft, and means to connect. said member to said shaft, said member having a series of angular-1y spaced projections and said means including a device operable to successively engage different projections.

5. In a double index loom dobby, a pattern cylinder, cylinder shaft, a driven member freely rotatable about the axis of said shaft, and means to connect said memher to said shaft, said ,member having an inner and an outer circular series of angularly spaced projections and said means including a device operable to engage said inner and outer projections successively and alternately.

6. In a double index loom dobby, a pattern cylinder, a cylinder shaft, a driven member freely rotatable about the axis of said shaft, and means to connect said mem her to said shaft, said member having a series of angularly spaced projections and said means including a collar mounted to rotate with said shaft, a latch on said collar movable into position to engage different projections on said member, and pattern controlled means for moving said latch.

7. In a double index loom dob'by, a pattern cylinder, a cylinder shaft, a driven member freely rotatable about the axis of said shaft, and means to connect said member to said.sha-ft, said member having a series of angularly spacedprojections and said means including a collar mounted to rotate with said shaft, a latch on. said collar movable into position to engage different projections on said member, a spring to move said latch in one direction, a Islidable collar effective to move said. latch in the other direction, and pattern controlled means for moving said collar axially.

In testimony whereof I have hereunto aflixed my signature.

HENRY eannsnnr. 

